pop a splint
v. phr.— «The injury is in the area behind the knee, and is caused by too much stress on a bone that results in its outer covering becoming inflamed. In racing parlance, it’s called “popping a splint.”» —“Bellamy Road Hurt, Off Triple Crown Trail” in New York City ABC News May 10, 2005. (source: Double-Tongued Dictionary)
Further reading
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If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...